Re: [PATCH v1 01/11] configure: don't override the selected host test compiler if defined

[Alex Bennée]

Ed Maste <emaste@freebsd.org> writes:

> On Fri, 17 Sept 2021 at 12:27, Alex Bennée <alex.bennee@linaro.org> wrote:
>>
>> There are not many cases you would want to do this but one is if you
>> want to use a test friendly compiler like gcc instead of a system
>> compiler like clang. Either way we should honour the users choice if
>> they have made it.
>
> A little bit of a tangent, but I'm curious about this comment - what
> aspects of GCC make it more test friendly? (I help maintain LLVM tools
> on FreeBSD, and would like to make sure they provide as good an
> experience as possible.)

Some of the inline assembler in the old tests trips up LLVM. There is a
chance the inline assembly is a bit bogus with it's constraints and GCC
is just a bit more lax and accepting.

I'm totally fine with merging something that restores support for clang
for building tests it just needs the appropriate fixups to the tests. We
already use clang for the hexagon builds after all. Once that is done we
can drop the stuff in cf22f936f2 (tests/tcg: don't allow clang as a
cross compiler).

-- 
Alex Bennée